Steam heating plant



May 19, '1931. A. MIERSBE STEAM HEATING PLANT Filed June 18, 1927 4...I...Iii-:mlvw d Patented Mayl 19, 1931 PATENT OFFICE .mons mEnsBE, 'forRADERTHAL, NEAR. coLoeNE-oN-THE-nnmn, GERMANY samen HEATING :emr

Application llled June 18, 1927, Serial No. 195,839, and imGermany July24, 1928.

My invention relates to a steam heating plant combined with a steamdraining device provided with an automatic suction pipe closure, thewhole being intended for steamheating plants in which the steamcirculates continuously and into which low pressure steam, for instance,exhaust-steam, is sucked from a pipe specially provided for this purose.

p It is known that the consumption of steam in a heating plant isdierent at dierent times according to the number of the radiators or thesize of the radiating surfaces supplied with the steam, and inconsequence thereof also the amount of steam passing through theregulating device varies accordingly. It is, therefore, in order'toattain a continually, as well as a most effective uniform suckingaction, necessary to alter or adjust correspondingly the free Ysectional area of the nozzles.

With jet devices in which the free sectional area of the nozzles can bealtered or adjusted by means of a movable nozzle core this Vcoreimpairs-the` suckingr action because it presents to the steam flowingthrough the nozzle a certain resistance by which the velocity of thesteam is reduced. The object of the present invention is to obviate thatdrawback, and I attain this object by providing the nozzle core with abore constituting another nozzle, an inner nozzle having no nozzle core.Y Hereby it is rendered possible that when `heating surfaces aredisconnected from the steam, and the amount of steam passing through thelnozzle is, therefore, reduced, the steam can flow freely andunimpededly through said bore or inner nozzle. The

' greatest possible sucking action is now main- 46 tained which isindispensably requisite with heating plants with circulating steam inwhich the returning steam is re-introduccd into the circuit by thesucking action of the jet-nozzle. l

`When a large heating surface is to be connected up to the steam supplyit is, by the present invention, rendered possible to cause a largeramount of steam to flow through the double-nozzle formed by the borementioned in the preceding paragraph than can flow through a nozzleprovided with a solid nozzle core.

` In order to attain with heating plants with circulating steam the mostfavorable heating effect and to maintain the good eiiciency of thejet-nozzle it is indispensably requisite that the returning steam isfree from condensed steam when re-entering the heating pipes. For thispurpose the improved device forming the subject matter of this ino0vention is provided with a steam draining device located in the suctionchannel and combined with an' automatic device closing this channel whena comparatively large amount of condensed steam collects in said o5steam-draining device, so that no wet steam or condensed steam can findaccess to the heating pipes through the jetr apparatus, Steam can thenbe sucked into these pipes only after the condensed steam has beendischarged and the steam present in the draining device is again dry.

It is, from economical reasons, advantageous to discharge into theheating plant p1pes, and to utilize therein, the entire amount of theexhaust-steam of steam engines, steam hammers, steam compressors and thelike. There is, however, the diiliculty to overcome to introduce thisexhaust-steam into the heating plant pipes (which are fed with livesteam) in such a manner that no backsurge occurs which would diminishthe efficiency of the steam-engine or the hke. From this reason thearriving exhaust steam is introduced into the suction channel, and thejet nozzle sucks in said steam also, whereby not only back-surge isobviated, but, besides, a reduced pressure in the exhaust-steam pipe isobtained whlch produces t i1aving of steam in the steam-engine or the 9oThe invention is illustrated diagrammatically and by way of example onthe accompanying drawing on which is shown a vertical, as Well as axialsection through an arrangement and combination of parts designedaccording to this invention.

On the drawing, a denotes the branch where the live. steam enters intothe heatin plant; this Steam iiows through the jet 'an 1.00

" regulating device inthe direction of the arrows and passes thenthrough the pipe c into the pipes d1 and d2 by which the steam.

is distributed onto the radiators. The steam 'then passes through thepipe e into. the

draining device f from which the drained steam .is conducted back intoythe circuit through the pipe g, the valve w. and the pasi io.

sage g, whereas the Water of condensation is `removed with the aid of,and through, the

meet in the space o where they exert a, sucking action upon the steamflowing through the pipe g, this steam becoming now mixed with saidcurrents and this mixture passing then to the radiators.

The free sectional areas of the nozzles are so chosen that the amountsof steam passing through them is sufficiently large to attain a goodheating effect, and that their sucking action is suiiciently great tocarry the steam from the pipe g along with them.

As, however, the heating surface is-notalways fully utilized, forinstance if any of the radiators are disconnected from the steam supply,the amount of thesupplied steam must be reduced correspondingly bydiminishing thefreeqsectional area of the nozzle inlsuchla measure thatalso afterwards the most advantageous suction effect is obtained.Thisiggf'grendered possible by the double nozzle shown. The ,nozzlemember lr: is firmly connectedl with the [valve i 'and can,therefore,-bemovedraxially with it. When the valve is fully open and thefree sectional a-reaof the annular passage l is the largest,

- .the full amount of the steam can flow there- Ythrough tle/ saidannular' passage,

through, but when the valve is less open therefore, correspondinglyreduced, t e smaller amount of steam will pass not olroily ut throughthefchamber n, also, whereby the suction effect" of the steam withrespect to the tube g is maintained. If only an ordinary orsingle'lnozzle is provided, as usual, the suction effe t is greatlyimpaired vwhen lthe amountof team becomes smaller. An-

other ei'ect of the double nozzle consistsin an increase of speedof thesteam which is also very iuseul for the'Y sucking action, so that theelliciency of the heating plant is considerably improved. 'f

'Bhe steam draining vessel f is provided and the-free sectional areaofsaid passa e,

with a float -r connected with a valve s in such a manner that the flowof the steam is interrupted when the water of condensation t has reacheda certain predetermined level, whereas the valve is kreopened.automatically when the level of the water of condensation sinks owingtoapart of ithaving escaped through the vessell h. If this waterdischarging vessel-fails or if the steam arrives vin the vessel f in avery wet state,

the level of the water of condensation t will rise, the float will closethe tube g, and no steam from the vessel f will be sucked through thetube g into the nozzles and through it, and this state will continueuntil such an amount of the Water t has been withdrawn that in themeantime the steam has been changed from wet steam to practically drysteam. v

' The tube u terminating into the pipe g above the valve w is theexhaust-tube of a steam-engine and provided with a non-return valve vpreventing the exhaust steam from flowing in the reverse direction whenthe engine has come to a standstill. m denotes a water-and oil-separatorpreventing the exhaust-steam from carrying water of condensation intothe nozzle and from soil- .ing it and the other parts of the heatingsteam circuit with oil. The object of the valve 'w is to prevent thevessels f and h from being affected bv eventual irregularities in theamounts of the steam exhausted from the respective engine into andthrough the tube u.

The inner cone m is so adjusted by means of the hand-wheel p that astate of equllibrium is obtained and maintained in the circuit .formed bthe radiators, the vessel f,

the tube g, the oublc-nozzle, and the pipes o and d1 d2. In the state ofequilibrium the Yvalves v and lw are opened to the proper extent by thesucking action ofthe steam fiowi'ngthrough the double-nozzle, the steamthat has passed said valves has no tendency to reverse itsydirection,lthe steam engine runs with very slight back-pressure, and the exhauststeam is utilized fully in the circuit of the heating plant.

lclaim;

1. 'A Ysteam heating plant comprising, in combination, a live steamconduit; a mixing device communicating with said conduit; a distributingconduit connected to said mixing device; radiators connected to saiddistributing conduit; and'a collecting conduit receivin vthe waste steamfrom said radiators an opening into said mixing device; said mixingdevice including a double nozzle comprising a fixed outerl nozzle shell,and a hollow nozzle core within said shell, the interior ofthe core andthe space between the into the interior pressure steam conduit. l

of said core, and a casing surrounding said shell and communlcatlng withsai tributing conduit, said collecting conduit opening into the spacebetween said casing and shell being and shell; said nozzle core movablerelatively to each other.

2. The combination as set forth in claim 1, and a controlling andclosure member rigidly connected to the movable part of said doublenozzle and arranged to vary or shut oli' the feed of live steam to thespace between the nozzle shell and core.

3. The combination as set forth in claim 1, wherein said casing is of taered form alrlid forms an annular nozzle wit the nozzle s e l.

4. The combination as set forth in claim 1, and a water separatorlocated in the collecting conduit, anda valve controlled by the heightof the water in said separator for controlling the feed of steam fromthe collecting conduit to said mixing device.

5. The combination as set forth in claim 1, and a conduit connected tosaid collecting conduit and adapted to feed low pressure steamthereinto.

6. In a steam heating plant, in combination, a steam distributingconduit, a nozzle opening axially into said conduit and having iisdischarge end spaced from the walls of said conduit, a conduit feedinglive steam under high pressure to said nozzle to reduce the pressure inthe space about the discharge end of the nozzle, a low pressure steamconduit communicating lwithv said Space so that a suction eect isexerted upon the low pressure steam conduit when said live steam passesthrough the nozzle and means for varying the effective nozzle out- Howarea.

7. The combination as set forth in claim -6 anda water separator locatedin said low In testimony whereof I affix my signature. ADOLF MIERSBE.

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